We speculate that a mechanism, similar to that revealed
for asymptotic giant stars, see particularly [1]}
and [2]},
in which multiplicity generates a latitude dependence of the stellar wind, should
be at work in the context of red supergiant stars as well, and in particular
to the central star(s) of NGC 6888 before it adopted a Wolf-Rayet spectral type.
Other possibility could be alternative evolution scenario involving an (eruptive) luminous blue
variable event, e.g. within a blue loop [3]}, [4]},
however less in accordance with the dust size measures of [5]}
shown to be typical for red supergiants.
Their constraint of the initial mass of WR136 to \(\approx 50\) -\(60\, \rm M_{\odot }\) 
might reconcile both arguments, dust and asymmetries being generated at different
phases of the complex evolution of a (potentially multiple) stellar system.
Our allegation that the driving stellar object of NGC 6888 is not, despite the findings
of [6]}, [5]}, a single star, is supported by
the detection of periodical modulation in line emission from the Wolf-Rayet star
WR 134, interpretable as an inhomogeneous outflow [8]}
or as a trace of a so far undetected close companion [9]}.

The close companions to
evolved massive stars [10]} and the circumstellar
nebulae of extragalactic Wolf-Rayet stars such as GR290 in the Galaxy
M33 [11]}, [12]} also support our arguments.

All this motivates further investigations of that problem.
